Buckle assembly for tightening strap



FIG. 1 is a top plan view showing my new design for a buckle assemblyfor tightening strap;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a side elevational view thereof of the side opposite to thatshown in FIG. 3;

FIG. 5 is an end elevational view thereof; and

FIG. 6 is an end elevational view thereof of the side opposite to thatshown in FIG. 5.

The ornamental design for a buckle assembly for tightening strap, as shown. 